Adjustable chair



ysept. 15,` 1936.

ADJUSTABLE CHAIR Filed May 6, 1935 mwN-fon:

Roy fl. Gramer and Jesse E drame?? Z BY 7 82 l Afron'umr.

Patented Slept. l5, 1.936

' UNITED STATES ADJUSTABLE CHAIR.

vltoy' A. Cramer and Jesse F. Cramer, Kansas City, Mo.

Application May 6,v 1935, Serial No. 20,033

3 Claims.

Our invention relates to adjustable chairs and while it is designed more particularly for oilice use it may be employed to advantage in other places where a chair of this character is desired.'

One object of the invention is to provide a comfortable chair in` which the seat and back can be readily adjusted independently of each other to suit the convenience of the user and then be reliably locked in any of the adjusted positions. A further object is to provide the Lchair with an adjustable back-rest and novel means forv tilting said back-rest to different inclinations.

Other objects will hereinafter appear and'in order that the invention may be'fully understood,

l5 reference will now be had to the-accompanying drawing, in which: y v

Fig. l is a side elevation':othechair with some of the parts broken away andesome in section.

Fig. 2 is an end elevation of a tiltabie backrest with its supporting and adjusting means in v'section.

Fig. 3 is a plan. view of the back-rest and its supporting and adjusting means.

" Fig. 4 is a side elevation, partlyin section,jof

the chair seat and its supporting means.-

Fig. 5 is a detail perspective-view of lthe baclrp f I2 at a point near the hub I6. Theplunger 66 rest supporting member.

Fig. 6*-isa detail vsectional'vil'ew of a'. plunger.v 'w 30 In carrying out tl'ieinvention we employ aplurality (preferably four innumberl 'of legs 2 mounted 'at their lower ends upon castersv 4 and united' at their upper ends by a centrally-disposed member 6.

6 designates aseat'which'is preferably made of sheet-metal and equipped with a suitable cushion III for the comfort of the occupant. -The seat 8 is mounted uponA suitable supporting means which permits the seat to be rotated independently of the legs 2 and adjusted vertically to different elevations. l

The seat supporting meanscomprises a spider I2 and a vertically-disposed shaft I4. The spider I2 comprises a centrally-disposed hub -I6 and a plurality` (preferably three in number) of arms I8 radiating from said hub I6 and having up- ,wardly projecting outer terminals 20 to which the seat 8 is fixed by suitable means such, for instance, as rivets 22. The hub I6 is swiveled upon the upper portion of the shaft I4 and Asecured against accidental'displacement by meansv of a 'set screw 24 threaded into the hub I6 and projecting into a circumferential groove 26 formed in said shaft I4. The shaft I4 is'slidably mounted in a central opening extending vertically through the member 6, but secured from rotation therein by a set screw 26 threaded into the member 6 and projecting into a vertical groove'30 in said shaft I4.

32 designates a plunger which cooperates with 5 a vertical series of recesses 34 in the shaft I4 in l securing lthe latter at different elevations in the member 6. The plunger 32 is forced into any registering recess 34 by means of a coil spring 36 and provided with a knob 38 whereby it may be with- 1 drawn from the recess when it is desired to raise or lower the shaft I4. The lspring 36 is arranged Within a housing 40 threaded into the member 6 and forming a support for the plunger 32 which is slidably mounted within said housing. u

Referring now more particularly, to the back vof the chair, 42 designates a supportingmember bent approximately at right-angles to provide a horizontal arm 44 and an upright arm 46 havling series of holes 4l and 50, respectively. The n horizontal arm 44 is slidably mounted in the upper slotted portions 52 and 54 of the spider I2, but is normally held stationary by means of a plunger 66 adapted to enter any registering hole 46 towards which it is urged by means of a coll 25 spring 6l. The plunger 66 and the spring 68 are mounted in a housing 66 threaded into the spider is provided at its lower end with a knob 62 whereby it may be retracted against the action of 30 the spring 68 when itis desired to release the arm 44 preparatory to sliding the same forwardly or backwardly.

64 designates a back-rest provided at its upper' portion with a U-shaped member 66 tiltably con- 35 nected by pivots 66 to a sleeve 10 slidably mounted upon the upright arm 46 of the supporting member 42. 'Ihe sleeve'r 10 is provided with a plunger 12 adapted to enter any of the openings 50 in the arm 46 amil thus support the sleeve 'I0 40 n and the back-rest 64 at different elevations. The plunger 'l2 is urged forwardly by a coil spring I4 and provided at one end with a threaded rotatable member 'I6 which may be adjusted forwardly or backwardly to give greater or less inclination to 45 the back-rest 64. The plunger 12 and the spring I4 are mounted in a housing 'I6 iixed to the sleeve 1li. A pin 60 extending into the housing 'I8 and a longitudinal slot 62 formed in the plunger 12, prevent the latter from turning with the rotat- 50 able member 16.

With the foregoing construction it is apparent that the seat 8 may be raised or lowered and then secured at the desired point with the plunger 32.

It is also apparent that the supporting member 55 42 may be adjusted forwardly or backwardly to adjust the back-rest 64 relative to the seat 8. 'I'he back rest 64 may also be adjusted vertically to carry it towardsl or away from the s'eat 8 and .after such adjustment, be secured by the plunger 12. The supporting member 42 is preferably made of spring steel so that it may yield to a limited degree when the occupant of the chair leans backwardly against a cushion 84 with which the ,back-rest 64 is equipped.

From the foregoing description it is apparent that we have provided an adjustable chair possessing the advantages hereinbefore pointed out, and while We have shown and described a preferred embodiment of said chair we reserve all rights to such changesand modifications as propsleeve, spring means for forcing said plunger into any one of the holes in said supporting member, and a rotatable member threaded upon said plunger and bearing against the back-rest for changing the inclination of the latter.

2. In a chair', a supporting member provided with an upright arm, a sleeve slidably embracing said upright arm, a spring pressed plunger mounted in said sleeve and adapted to secure the latter from laccidental movement upon said upright arm, a back-rest tiltably mounted upon the sleeve, and a rotatable member threaded upon the plunger and abutting said back-rest and whereby the latter may be adjusted to diierent inclinations. v

3..In a chair, asupporting member provided with anupright arm having a series of holes, a sleeve slidably embracing said upright arm, a

spring-pressed plunger mounted in said sleeve and adapted to enter any one of said holes brought in registry therewith, a back-rest pivotally mounted Aupon the sleeve, and a rotatable member threaded upon the plunger and abutting said backrest and whereby the latter may be adjusted to n diiierent, inclinations.

ROY A. CRAMER.

JESSE F. GRANIER. 

